How long are horses pregnant?
320 to 370 days
typically 335 to 340 days
A mare's gestation typically runs 335 to 340 days, though it can range from 320 to 370 days.
- Colts tend to gestate 2 to 7 days longer than fillies.
- Mares foaling in late spring and summer (long days) tend to have a shorter gestation than those foaling in January or February.
These are the documented figures; individual animals vary and a veterinarian is the right reader of any concern.
Grounded in: blogs.ifas.ufl.edu, extensionpubs.unl.edu. Every figure above appears
verbatim in the linked sources.
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